Myosin X PH1N-PH2-PH1C tandem

Experimental Data Snapshot

  • Resolution: 2.53 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.221 

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Structural basis of the myosin X PH1N-PH2-PH1C tandem as a specific and acute cellular PI(3,4,5)P3 sensor

Lu, Q.Yu, J.Yan, J.Wei, Z.Zhang, M.

(2011) Mol Biol Cell 22: 4268-4278

  • DOI: https://doi.org/10.1091/mbc.E11-04-0354
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Myosin X (MyoX) is an unconventional myosin that is known to induce the formation and elongation of filopodia in many cell types. MyoX-induced filopodial induction requires the three PH domains in its tail region, although with unknown underlying molecular mechanisms. MyoX's first PH domain is split into halves by its second PH domain. We show here that the PH1(N)-PH2-PH1(C) tandem allows MyoX to bind to phosphatidylinositol (3,4,5)-triphosphate [PI(3,4,5)P(3)] with high specificity and cooperativity. We further show that PH2 is responsible for the specificity of the PI(3,4,5)P(3) interaction, whereas PH1 functions to enhance the lipid membrane-binding avidity of the tandem. The structure of the MyoX PH1(N)-PH2-PH1(C) tandem reveals that the split PH1, PH2, and the highly conserved interdomain linker sequences together form a rigid supramodule with two lipid-binding pockets positioned side by side for binding to phosphoinositide membrane bilayers with cooperativity. Finally, we demonstrate that disruption of PH2-mediated binding to PI(3,4,5)P(3) abolishes MyoX's function in inducing filopodial formation and elongation.

  • Organizational Affiliation

    Division of Life Science, State Key Laboratory of Molecular Neuroscience, Molecular Neuroscience Center, Kowloon, Hong Kong, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin X228Rattus norvegicusMutation(s): 3 
Gene Names: Myo10
Membrane Entity: Yes 
Find proteins for D3ZJP6 (Rattus norvegicus)
Explore D3ZJP6 
Go to UniProtKB:  D3ZJP6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD3ZJP6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.53 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.221 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.84α = 90
b = 36.84β = 90
c = 154.13γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-07
    Type: Initial release
  • Version 1.1: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description